Rapid analysis method of lead in gold mud

A rapid analysis and gold mud technology, which is applied in the direction of material analysis by observing the influence of chemical indicators, and analysis by making materials undergo chemical reactions, can solve the problems of high valence state of gold ions, difficult separation, encapsulation and adsorption, etc. , to achieve the effects of improving detection efficiency, quick and easy operation, and simplifying operation steps

Active Publication Date: 2015-11-11
山东黄金冶炼有限公司
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Problems solved by technology

But this method is not applicable to the analysis of lead content in gold mud, reason is to have following drawback: the first, after sulfuric acid fumes, chloroauric acid decomposes incompletely, remains the gold of a small amount of compound state, adds sulfuric acid acidification precipitation lead During the process, due to the long aging time, the valence state of gold ions is high and the particle size is large, it is easy to be wrapped and adsorbed by lead sulfate preci

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  • Rapid analysis method of lead in gold mud
  • Rapid analysis method of lead in gold mud
  • Rapid analysis method of lead in gold mud

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[0029] Below in conjunction with embodiment further illustrate the present invention.

[0030] 1. Examples of analysis methods.

[0031] Main reagents: Reagents and standard solutions are basically the same as the requirements in GB / T7739.5, and the different parts will be explained separately.

[0032] Sample pretreatment: Put the prepared gold mud sample (hereinafter referred to as the sample) into a constant temperature drying oven, set the temperature at 105-110°C, and after drying to a constant weight, take it out and put it in a desiccator to cool to room temperature for later use. This process is mainly used to remove the moisture in the sample to ensure the accuracy of the capacity analysis results.

[0033] Analysis steps:

[0034] 1. Sample dissolution: Accurately weigh 0.2000g ~ 1.0000g sample into a 300mL beaker, moisten it with a little water, add 15mL nitric acid (1+1), cover with a watch glass, and heat to a slight boil on a hot plate. When there is no red-br...

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Abstract

The invention relates to a rapid analysis method of lead in gold mud. The method comprises the following steps: processing a sample by nitric acid, aqua regia, sulfuric acid, and a mixed acid of nitric acid and sulfuric acid in sequence, after the acid is smoked and evaporated, adding diluted sulfuric acid, boiling to dissolve the salts, adding excess sodium hyposulfite to reduce gold to zero valent and precipitate silver; allowing the system to stand still to carry out aging, filtering, washing the precipitate by diluted sulfuric acid and water; dissolving the precipitate by an acetic acid-sodium acetate buffer solution, filtering, recovering gold and silver, adding a xylenol orange indicator into the filtrate, dropwise adding EDTA until the color of the solution changes from purple-red to light yellow, wherein the color change shows that the titration end point is reached, and finally calculating the lead content. In the provided method, sodium hyposulfite is used to reduce gold and precipitate silver so as to effectively separated gold and silver from lead, thus the interference of gold and silver on the end point is avoided, moreover, the operation is largely simplified, and precise and stable analysis results can be obtained by the provided method.

Description

technical field [0001] The invention relates to a rapid analysis method for lead, in particular to a rapid analysis method for lead in gold mud. Background technique [0002] Gold mud is an important intermediate product in the process of gold smelting. It is a black and similar muddy substance obtained from the cyanide-containing liquid by adding reducing substances. In addition to gold and silver, it is mainly composed of copper, iron, lead, zinc, etc. metal composition. [0003] At present, the traditional determination methods of lead include EDTA titration, sodium acetate bottom solution polarography, pyrogallol red absorptiometry and flame atomic absorption method. These analytical methods are relatively mature and have a wide range of applications. However, the content of gold and silver in the gold mud is relatively high. When the traditional determination method is used to analyze the lead content, the gold and silver seriously interfere with the titration analysi...

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Application Information

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IPC IPC(8): G01N21/78
Inventor 单召勇周发军刘瑞强杨海江
Owner 山东黄金冶炼有限公司
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